TDA1547

The TDA1547 is a dedicated one-bit digital-to-analog converter to facilitate a high fidelity sound reproduction of digital audio. The TDA1547 is extremely suitable for use in high quality audio systems such as Compact Disc and DAT players, or in digital amplifiers and digital signal processing systems. The TDA1547 is used in combination with the SAA7350 bitstream circuit, which includes thethird-order noise shaper. The excellent performance of the SAA7350 and TDA1547 bitstream conversion system is obtained by separating the noise shaping circuit and the one-bit conversion circuit over two IC's, thereby reducing the crosstalk between the digital and analog parts. The TDA1547 one-bit converter is processed in BIMOS. In the digital logic and drivers bipolar transistors are used to optimize speed and to reduce digital noise generation. In the analog part the bipolar transistors are used to obtain high performance of the operational amplifiers. Special layout precautions have been taken to achieve a high crosstalk immunity. The layout of the TDA1547 has fully separated left and right channels and supply voltage lines between the digital and analog sections.